{"id":53013,"date":"2019-11-21T00:00:00","date_gmt":"2019-11-20T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/zimbra-i-zashhita-ot-spama"},"modified":"2020-02-18T14:00:51","modified_gmt":"2020-02-18T11:00:51","slug":"zimbra-i-zashhita-ot-spama","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/administrirovanie\/zimbra-i-zashhita-ot-spama","title":{"rendered":"Zimbra och skydd mot skr\u00e4ppost","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

En av de centrala uppgifterna som en administrat\u00f6r f\u00f6r en egen e-postserver p\u00e5 ett f\u00f6retag st\u00e5r inf\u00f6r \u00e4r att filtrera e-post som inneh\u00e5ller skr\u00e4ppost. Skadorna fr\u00e5n skr\u00e4ppost \u00e4r uppenbara och f\u00f6rst\u00e5eliga: f\u00f6rutom hotet mot f\u00f6retagets informationss\u00e4kerhet tar det upp utrymme p\u00e5 serverns h\u00e5rddisk och minskar medarbetarnas effektivitet n\u00e4r det hamnar i \"Inkorgen\". Att separera o\u00f6nskad reklam fr\u00e5n aff\u00e4rskommunikation \u00e4r inte en s\u00e5 enkel uppgift som det kan tyckas vid f\u00f6rsta anblicken. Faktum \u00e4r att det finns ingen l\u00f6sning som garanterar 100% resultat n\u00e4r det kommer till att filtrera o\u00f6nskad e-post, och en felaktigt konfigurerad algoritm f\u00f6r att uppt\u00e4cka o\u00f6nskad reklam kan orsaka f\u00f6retaget mycket mer skada \u00e4n sj\u00e4lva skr\u00e4pposten.<\/p>\n

\"Zimbra
\n<\/a><\/noindex>
\nI Zimbra Collaboration Suite \u00e4r skyddet mot skr\u00e4ppost implementerat med hj\u00e4lp av programvarupaketet Amavis, som implementerar SPF, DKIM och st\u00f6der svarta, vita och gr\u00e5 listor. F\u00f6rutom Amavis anv\u00e4nder Zimbra antivirusprogrammet ClamAV och skr\u00e4pfiltert SpamAssassin. F\u00f6r n\u00e4rvarande \u00e4r SpamAssassin den optimala l\u00f6sningen f\u00f6r att filtrera skr\u00e4ppost. Principen bakom dess funktion \u00e4r att varje inkommande e-postmeddelande kontrolleras mot regulj\u00e4ra uttryck som \u00e4r karakt\u00e4ristiska f\u00f6r o\u00f6nskad reklam. Efter varje genomf\u00f6rd kontroll tilldelar SpamAssassin meddelandet ett visst antal po\u00e4ng. Ju fler po\u00e4ng som samlas in i slutet av kontrollen, desto h\u00f6gre \u00e4r sannolikheten att det analyserade meddelandet \u00e4r skr\u00e4ppost.<\/p>\n

Ett s\u00e5dant bed\u00f6mningssystem f\u00f6r inkommande meddelanden g\u00f6r det m\u00f6jligt att flexibel konfigurera filtret. S\u00e4rskilt kan man st\u00e4lla in det antal po\u00e4ng vid vilket ett meddelande kommer att bed\u00f6mas som misst\u00e4nkt och skickas till \"Skr\u00e4ppost\", och man kan st\u00e4lla in det antal po\u00e4ng vid vilket ett meddelande kommer att tas bort permanent. Genom att konfigurera skr\u00e4pfiltreringssystemet p\u00e5 detta s\u00e4tt kan man l\u00f6sa tv\u00e5 fr\u00e5gor: f\u00f6r det f\u00f6rsta undvika att v\u00e4rdefullt diskutrymme fylls upp av v\u00e4rdel\u00f6s skr\u00e4ppost, och f\u00f6r det andra maximera antalet aff\u00e4rsmeddelanden som g\u00e5r igenom utan att bli blockerade av skr\u00e4pfiltret.<\/p>\n

\"Zimbra
\n
\nEtt av de st\u00f6rsta problemen f\u00f6r ryska anv\u00e4ndare av Zimbra \u00e4r den inbyggda antispam-systemets of\u00f6rm\u00e5ga att filtrera ryskspr\u00e5kig spam direkt fr\u00e5n b\u00f6rjan. Anledningen \u00e4r att det saknas inbyggda regler f\u00f6r kyrillisk text. V\u00e4sterl\u00e4ndska kollegor l\u00f6ser detta genom att utan undantag radera alla e-postmeddelanden p\u00e5 ryska. Och det \u00e4r sant att knappast n\u00e5gon, som \u00e4r vid sina sinnens fulla bruk, skulle f\u00f6rs\u00f6ka f\u00f6ra aff\u00e4rskommunikation med europeiska f\u00f6retag p\u00e5 ryska. Men anv\u00e4ndare fr\u00e5n Ryssland kan inte g\u00f6ra s\u00e5. Ett delvis s\u00e4tt att l\u00f6sa detta problem kan vara att l\u00e4gga till ryska regler f\u00f6r Spamassassin<\/a><\/noindex>, men deras relevans och tillf\u00f6rlitlighet kan inte garanteras.<\/p>\n

Tack vare den stora spridningen och den \u00f6ppna k\u00e4llkoden kan Zimbra Collaboration Suite integrera andra, inklusive kommersiella, l\u00f6sningar f\u00f6r informationss\u00e4kerhet. Men den mest optimala l\u00f6sningen kan vara ett molnsystem f\u00f6r skydd mot cyberhot. Konfigureringen av molnskyddet g\u00f6rs vanligtvis b\u00e5de fr\u00e5n tj\u00e4nsteleverant\u00f6rens sida och fr\u00e5n den lokala serverns sida. K\u00e4rnan i konfigurationen ligger i att den lokala adressen f\u00f6r inkommande e-post byts ut mot adressen f\u00f6r molnservern, d\u00e4r filtreringen av e-post sker, och d\u00e4refter skickas de meddelanden som har klarat alla kontroller till f\u00f6retagets adress. <\/p>\n

Ett s\u00e5dant system ansluts genom en enkel omdirigering IP-adress<\/a> av POP3-servern f\u00f6r inkommande e-post i MX-posterna p\u00e5 servern till ip-adressen f\u00f6r din molnl\u00f6sning. Med andra ord, om tidigare MX-posten f\u00f6r den lokala servern s\u00e5g ut ungef\u00e4r s\u00e5 h\u00e4r:<\/p>\n

domain.com. IN MX 0 pop
\ndomain.com. IN MX 10 pop
\npop IN A 192.168.1.100<\/p><\/blockquote>\n

\nS\u00e5 efter att ha bytt ip-adressen till den som tillhandah\u00e5lls av din molns\u00e4kerhetstj\u00e4nst (l\u00e5t oss anta att den kommer att vara 26.35.232.80), kommer posten att \u00e4ndras till f\u00f6ljande:<\/p>\n

domain.com. IN MX 0 pop
\ndomain.com. IN MX 10 pop
\npop IN A 26.35.232.80<\/p><\/blockquote>\n

\nUnder konfigurationen i kontrollpanelen p\u00e5 molnplattformen kommer det ocks\u00e5 att vara n\u00f6dv\u00e4ndigt att specificera dom\u00e4nadressen fr\u00e5n vilken otrimmad e-post kommer att anl\u00e4nda, samt dom\u00e4nadressen dit de filtrerade meddelandena ska skickas. Efter dessa \u00e5tg\u00e4rder kommer filtreringen av din e-post att ske p\u00e5 servrar som tillh\u00f6r en tredje part, som kommer att vara ansvarig f\u00f6r s\u00e4kerheten hos den inkommande e-posten p\u00e5 f\u00f6retaget.<\/p>\n

D\u00e4rf\u00f6r passar Zimbra Collaboration Suite utm\u00e4rkt f\u00f6r b\u00e5de sm\u00e5 f\u00f6retag som beh\u00f6ver en kostnadseffektiv men s\u00e4ker e-postl\u00f6sning och stora f\u00f6retag som st\u00e4ndigt arbetar f\u00f6r att minska riskerna kopplade till cyberhot.<\/p>\n

F\u00f6r alla fr\u00e5gor relaterade till Zextras Suite kan du kontakta f\u00f6retagets representant \"Zextras\", Katerina Triandafiliidi, via e-post p\u00e5 katerina@zextras.com
\n
K\u00e4lla: habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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